feat(commands): unify chat commands (#275)

* Chat commands: registry, access groups, Carbon

* Chat commands: clear native commands on disable

* fix(commands): align command surface typing

* docs(changelog): note commands registry (PR #275)

---------

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/auto-reply/commands-registry.test.ts

@@ -0,0 +1,52 @@
+import { describe, expect, it } from "vitest";
+
+import {
+  buildCommandText,
+  getCommandDetection,
+  listNativeCommandSpecs,
+  shouldHandleTextCommands,
+} from "./commands-registry.js";
+
+describe("commands registry", () => {
+  it("builds command text with args", () => {
+    expect(buildCommandText("status")).toBe("/status");
+    expect(buildCommandText("model", "gpt-5")).toBe("/model gpt-5");
+  });
+
+  it("exposes native specs", () => {
+    const specs = listNativeCommandSpecs();
+    expect(specs.find((spec) => spec.name === "help")).toBeTruthy();
+  });
+
+  it("detects known text commands", () => {
+    const detection = getCommandDetection();
+    expect(detection.exact.has("/help")).toBe(true);
+    expect(detection.regex.test("/status")).toBe(true);
+    expect(detection.regex.test("try /status")).toBe(false);
+  });
+
+  it("respects text command gating", () => {
+    const cfg = { commands: { text: false } };
+    expect(
+      shouldHandleTextCommands({
+        cfg,
+        surface: "discord",
+        commandSource: "text",
+      }),
+    ).toBe(false);
+    expect(
+      shouldHandleTextCommands({
+        cfg,
+        surface: "whatsapp",
+        commandSource: "text",
+      }),
+    ).toBe(true);
+    expect(
+      shouldHandleTextCommands({
+        cfg,
+        surface: "discord",
+        commandSource: "native",
+      }),
+    ).toBe(true);
+  });
+});